Ring-opening of epoxides 1 by heteroatom-substituted allyl anions 2 occurs with high regioselectivity. In situ tosylation of the resulting alkoxides 3 or tosylation of the corresponding alcohols 4 yields 4-pentenyl tosylates 5. Anion generation by deprotonation or desilylation gives vinylcyclopropanes 9 by an S(Ni) process. The approach allows annulation of vinylcyclopropanes onto existing five- and six-membered rings and synthesis of vinylcyclopropanes with functionality on the olefin.
Ring-opening of epoxides 1 by heteroatom-substituted allyl anions 2 occurs with high regioselectivity. In situ tosylation of the resulting alkoxides 3 or tosylation of the corresponding alcohols 4 yields 4-pentenyl tosylates 5. Anion generation by deprotonation or desilylation gives vinylcyclopropanes 9 by an S(Ni) process. The approach allows annulation of vinylcyclopropanes onto existing five- and six-membered rings and synthesis of vinylcyclopropanes with functionality on the olefin.
Ring-opening of epoxides 1 by heteroatom-substituted allyl anions 2 occurs with high regioselectivity. In situ tosylation of the resulting alkoxides 3 or tosylation of the corresponding alcohols 4 yields 4-pentenyl tosylates 5. Anion generation by deprotonation or desilylation gives vinylcyclopropanes 9 by an S(Ni) process. The approach allows annulation of vinylcyclopropanes onto existing five- and six-membered rings and synthesis of vinylcyclopropanes with functionality on the olefin.